Cement composition



106. COMPOSITIONS,

.LAGHIIH COATING R PLASTIC.

Patented Feb. 25, 1930 MAX .E. GBUNEWALD, OF ALLENTOWN, PENNSYLVANIA cnmEN-r oomrosrrron' Io Drawing. Application med June 4, 1828. Serial No. 282,894.

My invention relates to improvements in ticularly satisfactory results are obtainable cement, and has particular reference to by emplo g means for providing a cement having a uni- Wate, s qdiumbicallbolli igiw M form short setting time. car a I I m,bicarhonate,.am-,

As is well known, if ordinary Portland monium carbonate or ammo 1u bicarboncement, or other cements, is mixed with an e. erimen s w 1c av' c'o'riducte excess of water, such as 1 part by weight of indicate that various other water soluble salts water, to 1 part by weight of cement, for of carbonic acid are suitable for this purproducing a thin fluid grout, the fluid grout pose. may not properly set. If the setting occurs, As an example of an embodiment of my inthe cement settles in the water, with an acvention, I produce a cement composition emcumulation of water above the same. When bod ing the following ingredients, employed the fluid grout is introduced into water or in t e proportions stated: mud, thus increasing the excess of water, the 100 parts by weight of ground Portland setting of the cement is further prevented. M There is a tendency for the particles of the cement to be held in suspension ip the water, with the result that a'solid mass of concrete is not produced.

In accordance with my invention, use of my accelerating the cement and water, 1y begin to stiffen or such water soluble salts as socement clinker 3 parts by weight of round sum and 1 part by weight of so dlum carbonate. As a further exampmirl alt of my invention, I produce a cement composiby the tion embodying the following ingredients, agent, combined with employed in the proportions stated: the cement will quick- 100 parts by weight of ggound Portland set, in the presence of an excess of water, and will continue to stifien or set until it has become completely 4: parts by weight of roun Jsum and, set for producing a solid dense concrete. 2 parts by weight of sodmm carbonate.

My composition is adapted to be used for It is preferred to grin e ort and grout purposes generally, and may be used cement clinker, with or without the slag, with where there is an excess of free water or in the gypsum, and subsequently add the sodium mud or the like. The composition may also carbonate, although these ingredients may be be used for precast work, producing artificial ground together. These ingredients are thus stone, or the like. mixed in a dry state and are stored in bins In accordance with my invention, I provide or packed in bags or other containers, ready 0 osition includin a ground for the market.

as a Port a llii The cement composition thus produced is or anyo er suitable cemen c mEer. mixed with water, and I may add as high as add to this cement clinker, slag, such 100 parts by weight of water to 100 parts by I any other su tgblg, weight of the cement composition. To the I may add adtd to 1the ciement glimkerg sand, or mineral a re tes of sglected iizesf. I n which ma ega c ine gr unc cine I may prefe'r'aly a5 parts y weig t o gypsum. If desir ed, the may be the sand or aggregates, while the sand or omitted. The cement clinker with or withaggregates may be omitted. This will proout the slag or gypsum, constitutes the base duce a thin fluid grout, which may be poured, of the cement, and to this base, maligforced through tubes, or pumped to the de- T aent to cause the base to qmc 1y sired position, or sprayed. The fluid grout in l desired time, and under will quickly begin to stiffen or set and will disadvantageous conditions. The acceleratproduce a solid dense concrete. aent which I employ is a a 7 l a Ihave discovered that the rapidity at which c acid. I have found thatparthe composition will stifien or set, may be c ment clinker 56 parts by weight of ground slag,

, 1 sngm-ywtfiiued. cement composition and water,

regulated by regulating the amount of the accelerating agent employed. The accelerating agent may be added in from 1/20 of 1 per cent to 10 per cent b weight with respect to 5 the weight of the ase. The greater the amount of the accelerating agent, the more rapid will be the stifi'ening or setting action of the product.

The amount of water to be added to the composition may be varied widely, and the amount of the accelerating agent may also be varied in proportion to the amount of water. Thus where the amount of water is increased, a larger amount of the accelerating agent is also used, to obtain the same stifl'enin g or setting time of the mass.

It is to be understood that the form of my invention herewith shown and described, is to be taken as a preferred embodiment of the same, and that various changes may be resorted to in the proportions of the several ingredients, and that chemical equivalents may be employed, without departing from the spirit of m invention, or the scope of the subjoined c aims.

Having thus described my invention, I

\claim:-

1. A thin fluid grout comprising approximately 100 parts by weight of ground cement,

so 1/20th of 1% to 10% by weight of odium carbonate approximately 100 parts by weight of Wand approximately 100 parts by weight of divided inert aterial.

2. A thin ui grout comprising approxias mately 100 parts by weight of ground cement, approximately 1 part by weight of sodium carbonate, approximately 100 parts by weight of water and approximately 100 parts by weight of sand.

In testimony whereof I afiix my signature.

MAX E. GRUNEWALD. 

